基于质点追踪方法的渤海水交换特性  

Numerical simulation of water exchange characteristics in Bohai Sea based on particle tracing method

作　　者：张宇铭[1] 张淑芳[1] 宋朝阳[2] 吴克俭[2] 

机构地区：[1]国家海洋环境监测中心,辽宁大连116023 [2]中国海洋大学物理海洋实验室,山东青岛266100

出　　处：《海洋环境科学》2014年第3期412-417,共6页Marine Environmental Science

基　　金：海洋公益性行业科研专项经费项目(200905007);国家海洋局专项资助项目--渤海污染立体监测与动态评价

摘　　要：在渤海三维水动力模型的基础上,利用质点追踪方法对渤海水交换进行了研究。采用水体更新时间作为衡量水交换的标准,经计算得到渤海的平均水体更新时间为1 181.7 d。通过分析渤海的剩余质点比例曲线发现,初始位于渤海的物质量随时间的变化可分解为年际尺度上的指数衰减信号和1 a周期的震荡信号,其中年内震荡信号与河流总流量存在显著相关关系。通过指数曲线拟合分析,90%的渤海质点交换至渤海外部需要2 707 d。On the basis of 3-D hydrodynamic numerical model,Lagrangian particle tracking method is employed to study water exchange in Bohai Sea. The definition,flushing time,which is approximately 1 181. 7d in the Bohai Sea on average,is adopted to describe water exchange ability in this study. Besides,after analyzing plot of ratio of residual particle in the Bohai Sea,we conclude that,variations of initial substances over time within the Bohai Sea are supposed to be comprised of an exponential damping signal over interannual scale and a 1-year period oscillation,that is remarkably related to freshwater discharge in Bohai Sea. Results of exponential curve fitting also implies that it takes 2 707d for 90% particles to move outside the Bohai Sea.

关 键 词：渤海 水交换 质点追踪 

分 类 号：X87[环境科学与工程—环境工程]